<template>
  <div class="player" v-show="playlist.length>0">
    <transition name="normal"
                @enter="enter"
                @after-enter="afterEnter"
                @leave="leave"
                @after-leave="afterLeave"
    >
      <div class="normal-player" v-show="fullScreen">
        <div class="background">
          <img width="100%" height="100%" :src="currentSong.image"/>
        </div>
        <div class="top">
          <div class="back" @click="back">
            <i class="icon-back"></i>
          </div>
          <h1 class="title" v-html="currentSong.name"></h1>
          <h2 class="subtitle" v-html="currentSong.singer"></h2>
        </div>
        <div class="middle"
             @touchstart.prevent="middleTouchStart"
                @touchmove.prevent="middleTouchMove"
                @touchend="middleTouchEnd"
        >
          <div class="middle-l" ref="middleL">
            <div class="cd-wrapper" ref="cdWrapper">
              <div class="cd" :class="cdCls">
                <img class="image" :src="currentSong.image"/>
              </div>
            </div>
            <div class="playing-lyric-wrapper">
              <div class="playing-lyric">{{playingLyric}}</div>
            </div>
          </div>
          <scroll class="middle-r" ref="lyricList" :data="currentLyric && currentLyric.lines">
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p ref="lyricLine"
                    class="text"
                   :class="{'current':currentLineNum===index}"
                    v-for="(line,index) in currentLyric.lines">{{line.txt}}</p>
              </div>
            </div>
          </scroll>
        </div>
        <div class="bottom">
          <div class="dot-wrapper">
            <span class="dot" :class="{'active':currentShow==='cd'}"></span>
            <span class="dot":class="{'active':currentShow==='lyric'}"></span>
          </div>
          <div class="progress-wrapper">
              <span class="time time-l">{{format(currentTime)}}</span>
              <div class="progress-bar-wrapper">
                <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
              </div>
              <span class="time time-r">{{format(currentSong.duration)}}</span>
          </div>
          <div class="operators">
            <div class="icon i-left" @click="changeMode">
              <i :class="iconMode"></i>
            </div>
            <div class="icon i-left" :class="disableCls">
              <i @click="prev" class="icon-prev"></i>
            </div>
            <div class="icon i-center" :class="disableCls">
              <i :class="playIcon" @click="togglePlaying"></i>
            </div>
            <div class="icon i-right" :class="disableCls">
              <i @click="next" class="icon-next"></i>
            </div>
            <div class="icon i-right">
              <i :class="iconLike" @click="changeLike"></i>
            </div>
          </div>
        </div>
      </div>
    </transition>
    <transition name="mini">
      <div class="mini-player" v-show="!fullScreen" @click="open">
        <div class="icon">
          <img :class="cdCls" width="40" height="40" :src="currentSong.image"/>
        </div>
        <div class="text">
          <h2 class="name" v-html="currentSong.name"></h2>
          <p class="desc" v-html="currentSong.singer"></p>
        </div>
        <div class="control">
          <progress-circle  :radius="radius" :percent="percent">
            <i @click.stop="togglePlaying" class="icon-mini" :class="miniIcon"></i>
          </progress-circle>
        </div>
        <div class="control">
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <audio ref="audio" :src="currentSong.mid && 'http://ws.stream.qqmusic.qq.com/C100'+currentSong.mid+'.m4a?fromtag=46'" @canplay="ready"
           @error="error"
            @timeupdate="updateTime"
            @ended="end"></audio>
  </div>
</template>

<script type="text/ecmascript-6">
  import {mapGetters, mapMutations, mapActions} from 'vuex'
  import animations from 'create-keyframe-animation'
  import {prefixStyle} from '../../common/js/dom'
  import {playMode} from '../../common/js/config'
  import Scroll from '../../base/scroll/scroll.vue'
  import {playerMixin} from '../../common/js/mixin'
  import ProgressBar from '../../base/progress-bar/progress-bar.vue'
  import ProgressCircle from '../../base/progress-circle/progress-circle.vue'
  import {shuffle} from '../../common/js/util'
  import Lyric from 'lyric-parser'

  const transform = prefixStyle('transform');
  const transitionDuration = prefixStyle('transitionDuration');

  export default{
    data(){
      return {
        songReady: false,
        currentTime:0,
        radius:32,
        currentLyric:null,
        currentLineNum:0,
        currentShow:'cd',
        playingLyric:null,
        like:false
      }
    },
    computed: {
      cdCls() {
        return this.playing ? 'play' : 'play pause'
      },
      playIcon() {
        return this.playing ? 'icon-pause' : 'icon-play'
      },
      iconMode(){
        return this.mode === playMode.sequence?'icon-sequence':this.mode===playMode.loop?'icon-loop':'icon-random'
      },
      iconLike(){
        return this.like?'icon-favorite':'icon-not-favorite'
      },
      miniIcon() {
        return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
      },
      disableCls() {
        return this.songReady ? '' : 'disable'
      },
      percent() {
        return this.currentTime / this.currentSong.duration
      },
      ...mapGetters([
        'currentIndex',
        'fullScreen',
        'playlist',
        'currentSong',
        'playing',
        'mode',
        'sequenceList'
      ])
    },
    created(){
      this.touch={}
    },
    methods: {
      back(){
        this.setFullScreen(false)
      },
      open(){
        this.setFullScreen(true)
      },
      enter(el, done){
        const {x, y, scale} = this._getPosAndScale()

        let animation = {
          0: {
            transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
          },
          60: {
            transform: `translate3d(0,0,0) scale(1.1)`
          },
          100: {
            transform: `translate3d(0,0,0) scale(1)`
          }
        }

        animations.registerAnimation({
          name: 'move',
          animation,
          presets: {
            duration: 400,
            easing: 'linear'
          }
        })

        animations.runAnimation(this.$refs.cdWrapper, 'move', done)
      },
      afterEnter(){
        animations.unregisterAnimation('move');
        this.$refs.cdWrapper.style.animation = ''
      },
      leave(el, done){
        this.$refs.cdWrapper.style.transition = 'all 0.4s';
        const {x, y, scale} = this._getPosAndScale();
        this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale}`
        //transitionend 事件在 CSS 完成过渡后触发。
        this.$refs.cdWrapper.addEventListener('transitionend', done);
      },
      afterLeave(){
        this.$refs.cdWrapper.style.transition = '';
        this.$refs.cdWrapper.style[transform] = ''
      },
      togglePlaying(){
        if (!this.songReady) {
          return
        }
        this.setPlayingState(!this.playing);
        if(this.currentLyric){
            this.currentLyric.togglePlay();
        }
      },
      changeLike(){
          this.like=!this.like;
      },
      end(){
          if(this.mode===playMode.loop){
              this.loop()
          }else{
            this.next();
          }
      },
      loop(){
        this.$refs.audio.currentTime=0;
        this.$refs.audio.play();
        if(this.currentLyric){
            this.currentLyric.seek(0);
        }
      },
      next(){
        if (!this.songReady) {
          return
        }
        if(this.playlist.length===1){
            this.loop();
        }else{
          let index = this.currentIndex + 1;
          if (index === this.playlist.length) {
            index = 0;
          }
          this.setCurrentIndex(index);
          if (!this.playing) {
            this.togglePlaying()
          }
        }

        this.songReady=false
      },
      prev(){
        if (!this.songReady) {
          return
        }
        if(this.playlist.length===1){
          this.loop();
        }else {
          let index = this.currentPageIndex - 1;
          if (index === -1) {
            index = this.playlist.length - 1;
          }
          this.setCurrentIndex(index);
          if (!this.playing) {
            this.togglePlaying()
          }
        }
        this.songReady=false
      },
      ready(){
        this.songReady = true
      },
      error(){
        this.songReady=true
      },
      updateTime(e){
        this.currentTime=e.target.currentTime
      },
      format(interval){
        interval = interval | 0
        const minute=interval/60 | 0
        const second=this._pad(interval%60)
        return `${minute}:${second}`
      },
      onProgressBarChange(percent){
          const currentTime=percent*this.currentSong.duration;
        this.$refs.audio.currentTime=currentTime;
        if(!this.playing){
            this.togglePlaying()
        }
        if(this.currentLyric){
          this.currentLyric.seek(currentTime*1000)
        }
      },
      changeMode(){
          const mode=(this.mode+1)%3;
          this.setPlayMode(mode);
          let list=null;
          if(mode===playMode.random){
            list=shuffle(this.sequenceList);
          }else if(mode===playMode.loop){
            this.loop();
            return;
          }else{
              list=this.sequenceList;
          }
//          this.resetCurrentIndex(list);
          this.setPlaylist(list);
      },
      getLyric(){
        this.currentSong.getLyric().then((lyric)=>{
            this.currentLyric=new Lyric(lyric,this.handleLyric);
            if(this.playing){
              this.currentLyric.play();
            }
            console.log(this.currentLyric);
        }).catch(()=>{
            this.currentPlaying=null;
            this.playingLyric='';
            this.currentLineNum=0;
        })
      },
      handleLyric({lineNum,txt}){
          this.currentLineNum=lineNum;
          if(lineNum>5){
              let lineEl=this.$refs.lyricLine[lineNum-5];
              this.$refs.lyricList.scrollToElement(lineEl,1000)
          }else{
            let a=this.$refs.lyricLine[0];
            this.$refs.lyricList.scrollToElement(a,1000);
          }
          this.playingLyric=txt;
      },
      middleTouchStart(e){
          this.touch.initiated=true;
          const touch=e.touches[0];
          this.touch.startX=touch.pageX;
          this.touch.startY=touch.pageY;
      },
      middleTouchMove(e){
        if(!this.touch.initiated){
            return
        }
        const touch=e.touches[0];
        const deltaX=touch.pageX-this.touch.startX;
        const deltaY=touch.pageY-this.touch.startY;
        //纵轴>横轴
        if(Math.abs(deltaY)>Math.abs(deltaX)){
            return;
        }
        const left=this.currentShow==='cd'?0:-window.innerWidth;
        const offsetWidth=Math.min(0,Math.max(-window.innerWidth,left+deltaX));

        this.touch.percent=Math.abs(offsetWidth/window.innerWidth);
        this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetWidth})px,0,0)`;
        this.$refs.lyricList.$el.style[transitionDuration ]=0;
        this.$refs.middleL.style.opacity=1-this.touch.percent;
        this.$refs.middleL.style[transitionDuration ]=0;
        },
      middleTouchEnd(){
          let offsetWidth;
          let opacity
        if(this.currentShow==='cd'){
              if(this.touch.percent>0.1){
                offsetWidth=-window.innerWidth;
                opacity=0;
                this.currentShow='lyric';
              }else{
                offsetWidth=0;
                opacity=1;
              }
        }else{
            if(this.touch.percent<0.9){
              offsetWidth=0;
              this.currentShow='cd';
              opacity=1;
            }else{
                offsetWidth=-window.innerWidth;
              opacity=0;
            }
        }
        const time=300;
        this.$refs.lyricList.$el.style[transform]=`translate3d(${offsetWidth}px,0,0)`;
        this.$refs.lyricList.$el.style[transitionDuration ]=`${time}ms`;
        this.$refs.middleL.style.opacity=opacity;
        this.$refs.middleL.style[transitionDuration ]=`${time}ms`;
        },
      resetCurrentIndex(list){
          let index=list.findIndex((item)=>{
              return item.provide===this.currentSong.id
          })
          this.setCurrentIndex(index);
      },
      _pad(num,n=2){
        let len=num.toString().length;
        while(len<n){
            num='0'+num;
            len++
        }
        return num;
      },
      _getPosAndScale(){
        const targetWidth = 40;
        const paddingLeft = 40;
        const paddingBottom = 30;
        const paddingTop = 80;
        const width = window.innerWidth * 0.8;
        const scale = targetWidth / width;
        const x = -(window.innerWidth / 2 - paddingLeft);
        const y = window.innerHeight - paddingTop - width / 2 - paddingBottom;
        return {
          x, y, scale
        }
      },
      ...mapMutations({
        setFullScreen: 'SET_FULL_SCREEN',
        setPlayingState: 'SET_PLAYING_STATE',
        setCurrentIndex: 'SET_CURRENT_INDEX',
        setPlayMode:'SET_PLAY_MODE',
        setPlaylist:'SET_PLAYLIST'
      }),
    },
    watch: {
      currentSong(newSong,oldSong){
        if(newSong.id===oldSong){
          return;
        }
        if(this.currentLyric){
            this.currentLyric.stop();
        }
        setTimeout(() => {
          this.$refs.audio.play();
          this.getLyric();
        },1000)
      },
      playing(newPlaying){
        const audio = this.$refs.audio;
        this.$nextTick(() => {
          newPlaying ? audio.play() : audio.pause()
        })

      }
    },
    components: {
      Scroll,
      ProgressBar,
      ProgressCircle
    }
  }
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"
  @import "~common/stylus/mixin"

  .player
    .normal-player
      position: fixed
      left: 0
      right: 0
      top: 0
      bottom: 0
      z-index: 150
      background: $color-background
      .background
        position: absolute
        left: 0
        top: 0
        width: 100%
        height: 100%
        z-index: -1
        opacity: 0.6
        filter: blur(20px)
      .top
        position: relative
        margin-bottom: 25px
        .back
          position absolute
          top: 0
          left: 6px
          z-index: 50
          .icon-back
            display: block
            padding: 9px
            font-size: $font-size-large-x
            color: $color-theme
            transform: rotate(-90deg)
        .title
          width: 70%
          margin: 0 auto
          line-height: 40px
          text-align: center
          no-wrap()
          font-size: $font-size-large
          color: $color-text
        .subtitle
          line-height: 20px
          text-align: center
          font-size: $font-size-medium
          color: $color-text
      .middle
        position: fixed
        width: 100%
        top: 80px
        bottom: 170px
        white-space: nowrap
        font-size: 0
        .middle-l
          display: inline-block
          vertical-align: top
          position: relative
          width: 100%
          height: 0
          padding-top: 80%
          .cd-wrapper
            position: absolute
            left: 10%
            top: 0
            width: 80%
            height: 100%
            .cd
              width: 100%
              height: 100%
              box-sizing: border-box
              border: 10px solid rgba(255, 255, 255, 0.1)
              border-radius: 50%
              &.play
                animation: rotate 20s linear infinite
              &.pause
                animation-play-state: paused
              .image
                position: absolute
                left: 0
                top: 0
                width: 100%
                height: 100%
                border-radius: 50%

          .playing-lyric-wrapper
            width: 80%
            margin: 30px auto 0 auto
            overflow: hidden
            text-align: center
            .playing-lyric
              height: 20px
              line-height: 20px
              font-size: $font-size-medium
              color: $color-text-l
        .middle-r
          display: inline-block
          vertical-align: top
          width: 100%
          height: 100%
          overflow: hidden
          .lyric-wrapper
            width: 80%
            margin: 0 auto
            overflow: hidden
            text-align: center
            .text
              line-height: 32px
              color: $color-text-l
              font-size: $font-size-medium
              &.current
                color: $color-text
      .bottom
        position: absolute
        bottom: 50px
        width: 100%
        .dot-wrapper
          text-align: center
          font-size: 0
          .dot
            display: inline-block
            vertical-align: middle
            margin: 0 4px
            width: 8px
            height: 8px
            border-radius: 50%
            background: $color-text-l
            &.active
              width: 20px
              border-radius: 5px
              background: $color-text-ll
        .progress-wrapper
          display: flex
          align-items: center
          width: 80%
          margin: 0px auto
          padding: 10px 0
          .time
            color: $color-text
            font-size: $font-size-small
            flex: 0 0 30px
            line-height: 30px
            width: 30px
            &.time-l
              text-align: left
            &.time-r
              text-align: right
          .progress-bar-wrapper
            flex: 1
        .operators
          display: flex
          align-items: center
          .icon
            flex: 1
            color: $color-theme
            &.disable
              color: $color-theme-d
            i
              font-size: 30px
          .i-left
            text-align: right
          .i-center
            padding: 0 20px
            text-align: center
            i
              font-size: 40px
          .i-right
            text-align: left
          .icon-favorite
            color: $color-sub-theme
      &.normal-enter-active, &.normal-leave-active
        transition: all 0.4s
        .top, .bottom
          transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32)
      &.normal-enter, &.normal-leave-to
        opacity: 0
        .top
          transform: translate3d(0, -100px, 0)
        .bottom
          transform: translate3d(0, 100px, 0)
    .mini-player
      display: flex
      align-items: center
      position: fixed
      left: 0
      bottom: 0
      z-index: 180
      width: 100%
      height: 60px
      background: $color-highlight-background
      &.mini-enter-active, &.mini-leave-active
        transition: all 0.4s
      &.mini-enter, &.mini-leave-to
        opacity: 0
      .icon
        flex: 0 0 40px
        width: 40px
        padding: 0 10px 0 20px
        img
          border-radius: 50%
          &.play
            animation: rotate 10s linear infinite
          &.pause
            animation-play-state: paused
      .text
        display: flex
        flex-direction: column
        justify-content: center
        flex: 1
        line-height: 20px
        overflow: hidden
        .name
          margin-bottom: 2px
          no-wrap()
          font-size: $font-size-medium
          color: $color-text
        .desc
          no-wrap()
          font-size: $font-size-small
          color: $color-text-d
      .control
        flex: 0 0 30px
        width: 30px
        padding: 0 10px
        .icon-play-mini, .icon-pause-mini, .icon-playlist
          font-size: 30px
          color: $color-theme-d
        .icon-mini
          font-size: 32px
          position: absolute
          left: 0
          top: 0

  @keyframes rotate
    0%
      transform: rotate(0)
    100%
      transform: rotate(360deg)
</style>
